<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//
//  local_lights_drawOutline.frag
//  fragment shader
//
//  Created by Sam Gateau on 9/6/2016.
//  Copyright 2014 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

// Everything about deferred buffer
<@include DeferredBufferRead.slh@>

<$declareDeferredCurvature()$>

// Everything about light
<@include graphics/Light.slh@>
<$declareLightBuffer(128)$>
<@include LightingModel.slh@>


<@include LightPoint.slh@>
<$declareDrawPointOutline()$>
<@include LightSpot.slh@>
<$declareDrawSpotOutline()$>

<@include LightClusterGrid.slh@>


in vec2 _texCoord0;
out vec4 _fragColor;

void main(void) {

    // Grab the fragment data from the uv
    vec2 texCoord = _texCoord0.st;

    vec4 fragPosition = unpackDeferredPositionFromZeye(texCoord);
    DeferredFragment frag = unpackDeferredFragmentNoPosition(texCoord);

    if (frag.mode == FRAG_MODE_UNLIT) {
        discard;
    }

    frag.position = fragPosition;


    // Frag pos in world
    mat4 invViewMat = getViewInverse();
    vec4 fragPos = invViewMat * fragPosition;
    
    <$fetchClusterInfo(fragPos)$>;
    if (!hasLocalLights(numLights, clusterPos, dims)) {
        discard;
    }

    // Frag to eye vec
    vec4 fragEyeVector = invViewMat * vec4(-frag.position.xyz, 0.0);
    vec3 fragEyeDir = normalize(fragEyeVector.xyz);
    _fragColor = vec4(0, 0, 0, 1);
    
    int numLightTouching = 0;
    int lightClusterOffset = cluster.z;
    for (int i = 0; i < cluster.x; i++) {
        // Need the light now
        int theLightIndex = clusterGrid_getClusterLightId(i, lightClusterOffset);
        Light light = getLight(theLightIndex);

        // Clip againgst the light volume and Make the Light vector going from fragment to light center in world space
        vec4 fragLightVecLen2;
        vec4 fragLightDirLen;

        if (!lightVolume_clipFragToLightVolumePoint(light.volume, fragPos.xyz, fragLightVecLen2)) {
            continue;
        }

        // Allright we re in the light sphere volume
        fragLightDirLen.w = length(fragLightVecLen2.xyz);
        fragLightDirLen.xyz = fragLightVecLen2.xyz / fragLightDirLen.w;
        if (dot(frag.normal, fragLightDirLen.xyz) < 0.0) {
            continue;
        }

        numLightTouching++;

        // Allright we re valid in the volume
        float fragLightDistance = fragLightDirLen.w;
        vec3 fragLightDir = fragLightDirLen.xyz;

        vec3 color = vec3(0.0);
        if (evalLightPointEdge(color, light, fragLightDirLen, fragEyeDir)) {
            _fragColor.rgb += color;
        }
    }

    for (int i = cluster.x; i < numLights; i++) {
        // Need the light now
        int theLightIndex = clusterGrid_getClusterLightId(i, lightClusterOffset);
        Light light = getLight(theLightIndex);

        // Clip againgst the light volume and Make the Light vector going from fragment to light center in world space
        vec4 fragLightVecLen2;
        vec4 fragLightDirLen;
        float cosSpotAngle;

        if (!lightVolume_clipFragToLightVolumePoint(light.volume, fragPos.xyz, fragLightVecLen2)) {
            continue;
        }

        // Allright we re in the light sphere volume
        fragLightDirLen.w = length(fragLightVecLen2.xyz);
        fragLightDirLen.xyz = fragLightVecLen2.xyz / fragLightDirLen.w;
        if (dot(frag.normal, fragLightDirLen.xyz) < 0.0) {
            continue;
        }

        // Check spot
        if (!lightVolume_clipFragToLightVolumeSpotSide(light.volume, fragLightDirLen, cosSpotAngle)) {
            continue;
        }

        numLightTouching++;

        vec3 color = vec3(0.0);

        if (evalLightSpotEdge(color, light, fragLightDirLen, cosSpotAngle, fragEyeDir)) {
            _fragColor.rgb += color;
        }
    }

}